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Preparation method of durable antifreezing agent for concrete

A concrete and antifreeze technology, which is applied in the field of durable concrete antifreeze preparation, can solve the problems of poor antifreeze performance of concrete antifreeze, poor durability, and decreased concrete strength, so as to improve durability, improve antifreeze performance, Effect of increased salt content

Pending Publication Date: 2020-05-08
陈荣钦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a preparation method of durable concrete antifreeze in view of the defects of poor antifreeze performance, poor durability and reduced concrete strength of current concrete antifreeze agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of reaction slurry:

[0032] Put cotton and hydrochloric acid with a mass fraction of 5% into a beaker at a mass ratio of 1:5, place the beaker in an ultrasonic oscillator, vibrate at a frequency of 35 kHz for 2 hours, filter to obtain a filter cake after oscillation, and wash with distilled water filter cake 3 times, put the filter cake into a planetary ball mill after drying, and grind for 50 min under the condition that the rotating speed is 500r / min and the ball-to-material ratio is 10:1 to obtain the grinding material;

[0033] The above-mentioned ground material and the citric acid solution with a mass fraction of 8% were put into a three-necked flask at a mass ratio of 1:10, and the three-necked flask was placed in a water bath with a water bath temperature of 90 ° C, and a stirrer was installed in the three-necked flask to Stir at a speed of 300r / min for 20min, heat at a constant temperature for 3h after stirring, and lower the temperature of the wat...

Embodiment 2

[0041] Preparation of reaction slurry:

[0042] Put cotton and hydrochloric acid with a mass fraction of 7% into a beaker at a mass ratio of 1:5, place the beaker in an ultrasonic oscillator, vibrate at a frequency of 37kHz for 2.5h, filter to obtain a filter cake after oscillation, and use distilled water Clean the filter cake 4 times, put the filter cake into a planetary ball mill after drying, and grind for 55 minutes under the conditions that the rotating speed is 550r / min and the ball-to-material ratio is 10:1 to obtain the grinding material;

[0043] Put the above-mentioned grinding material and the citric acid solution with a mass fraction of 10% into a three-necked flask at a mass ratio of 1:10, place the three-necked flask in a water bath with a water bath temperature of 95°C, and install a stirrer in the three-necked flask to Stir at a speed of 350r / min for 25min, heat at a constant temperature for 3.5h after stirring, and lower the temperature of the water bath to 1...

Embodiment 3

[0051] Preparation of reaction slurry:

[0052] Put cotton and hydrochloric acid with a mass fraction of 9% into a beaker at a mass ratio of 1:5, place the beaker in an ultrasonic oscillator, vibrate for 3 hours at a frequency of 40 kHz, filter to obtain a filter cake after oscillation, and wash with distilled water filter cake 5 times, put the filter cake into a planetary ball mill after drying, and grind for 60 min under the condition that the rotating speed is 600r / min and the ball-to-material ratio is 10:1 to obtain the grinding material;

[0053] The above-mentioned ground material and the citric acid solution with a mass fraction of 12% were put into a three-necked flask at a mass ratio of 1:10, and the three-necked flask was placed in a water bath with a water bath temperature of 100°C, and a stirrer was installed in the three-necked flask to Stir at a speed of 400r / min for 30min, heat at a constant temperature for 4h after stirring, and lower the temperature of the wat...

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Abstract

The invention discloses a preparation method of a durable anti-freezing agent for concrete, belonging to the technical field of preparation of concrete additives. According to the invention, cotton isput into hydrochloric acid, and plant fiber components in the cotton are extracted through acid liquor soaking and high-temperature water boiling; then the surfaces of the plant fibers is modified byutilizing a citric acid solution, so carboxyl groups are allowed to be grafted into fiber molecules, and the structural strength of the concrete is improved by the anti-freezing agent in the concrete; meanwhile, the fiber components form electrostatic ion adsorption and hydrogen bond adsorption with sodium nitrite, calcium carbonate and other salts by utilizing carboxyl groups and other functional groups, so various salt components are uniformly dispersed in the anti-freezing agent for the concrete by utilizing the fiber components, and anti-freezing performance is improved; the plant fibersare subjected to high-temperature treatment, so the fiber components are carbonized, and the stability of the carbonized fiber components is improved; and since the various salt components are coatedwith carbon fiber tubes and the fibers are carbonized under a high-temperature condition, the roughness of the fiber components is enhanced in the carbonizing process , and the anti-freezing performance of the anti-freezing agent for the concrete is improved.

Description

technical field [0001] The invention discloses a preparation method of a durable concrete antifreeze, which belongs to the technical field of preparation of concrete additives. Background technique [0002] Concrete is a widely used building material. Admixtures can modify concrete and are indispensable and important additives in the application process of concrete, improving construction efficiency and application performance of concrete. Antifreeze is a type of concrete admixture. my country has used chloride salts as concrete antifreeze since the 1960s. [0003] Concrete antifreeze is a compound product, which can obviously improve the workability of concrete on the basis of improving the early strength, and the dosage is 2 to 5% of the total glue. When using, the dosage can be adjusted to meet the winter construction requirements of -5~-20°C. Concrete antifreeze is designed and developed in combination with winter application temperature conditions, commercial concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/60
CPCC04B40/0039C04B2103/601C04B14/022C04B24/383C04B24/122C04B24/20C04B22/124C04B24/123
Inventor 丁正颖
Owner 陈荣钦